Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems

Inactive Publication Date: 2005-05-26
IMRA AMERICA
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  • Abstract
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  • Application Information

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Benefits of technology

[0029] An additional improvement for these lasers that is not possible with solid-state oscillators is that the repetition rate can be lowered to match the repetition rate of the regenerative amplifier while significantly increasing the pulse energy from the fiber amplifier. The lower repetition rate reduces the tolerances on the Pöckels cell switch in the regenerative amplifier. With 50-100 megahertz sources, the Pöckels cell needs near 100% discrimination to prevent two pulses from being injected and amplified. If the repetition rate of the fiber amplifier is equal to the repetition rate of the regenerative amplifier, there is no need for discrimination between pulses and there just needs to

Problems solved by technology

Wavelength shifts due to additional losses cannot be corrected by increasing the pump level.
However, these elements will narrow the spectral output and broaden the temporal pulse output.
Regenera

Method used

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  • Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems
  • Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems
  • Utilization of Yb: and Nd: mode-locked oscillators in solid-state short pulse laser systems

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Embodiment Construction

[0042] A generalized illustration of the system of the invention is shown in FIG. 1. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator 11. These are coupled into a pulse conditioner 12 for spectral narrowing, broadening or shaping, wavelength converting, temporal pulse compression or stretching, pulse attenuation and / or lowering the repetition rate of the pulse train. The pulses are subsequently coupled into an Yb: or Nd: fiber amplifier 13. Pulse stretcher 14 provides further pulse stretching before the amplification in the regenerative amplifier 15 that is based on an Nd: or Yb: doped solid-state laser material. The compressor 16 compresses the pulse back to near transform limit. The six subsystems can be utilized to various degrees as is described in the subsequent embodiments.

[0043] The first embodiment is shown in FIG. 2. The Yb: oscillator 20 is the same as shown in FIG. 8 of co-pending U.S. application Ser. No. 09 / 576,772. The pulse width of the o...

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Abstract

An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and/or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This is a Continuation-In-Part of co-pending U.S. application Ser. No. 09 / 576,772 filed May 23, 2000, the disclosure of which is incorporated by reference in its entirety.TECHNICAL FIELD OF THE INVENTION [0002] The object of this invention is to optimize an Yb: or Nd: doped fiber mode-locked oscillator and fiber amplifier system for seeding a relatively new class of Nd: or Yb: doped regenerative amplifiers. These systems are seeing a significant interest since they are more suitable for industrial applications. An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier for seeding these regenerative amplifiers can improve the robustness and practicality of such systems for industrial applications. BACKGROUND OF THE INVENTION [0003] Regenerative amplifiers utilizing chirped pulse amplification (CPA) have been the dominant means for obtaining higher pulse energies with picosecond and femtosecond pulse duration. The CPA regen...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/37G02B6/02H01S3/00H01S3/06H01S3/067H01S3/094H01S3/10H01S3/109H01S3/16H01S3/23H01S3/30
CPCH01S3/005H01S5/5045H01S3/0078H01S3/0085H01S3/067H01S3/0675H01S3/06754H01S3/094042H01S3/109H01S3/1616H01S3/1618H01S3/1643H01S3/235H01S3/10023H01S3/0057
Inventor HARTER, DONALD J.CHO, GYU C.FERMANN, MARTIN E.HARTL, INGMAR
Owner IMRA AMERICA
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